v3.26.1
Operating segments (Details)
$ in Thousands
 6 Months Ended
Jun. 30, 2026
USD ($)
Customer
Dec. 31, 2025
USD ($)
Customer
Jun. 30, 2025
USD ($)
Segment information [Abstract]      
Other expenses $ (2,346) $ (1,645)  
Employee benefits and other expenses (2,287) (2,721)  
Net financing (expense)/income 626 296  
Loss before income tax (4,007) (4,070)  
Segment assets [Abstract]      
Exploration assets 214,737 209,009 $ 203,110
Other assets 64,358 23,534  
Total assets 279,095 232,543  
Segment liabilities [Abstract]      
Payables (1,909) (1,837)  
Provisions (393) (303)  
Total current liabilities (2,302) (2,140)  
Payables (106) (184)  
Total non-current liabilities (106) (184)  
Net assets $ 276,687 $ 230,219  
Number of major customers | Customer 0 0  
Revenues $ 0 $ 0  
Operating Segments [Member] | North America [Member]      
Segment information [Abstract]      
Other expenses (930) (741)  
Employee benefits and other expenses (1,150) (964)  
Net financing (expense)/income (2,200) (1,996)  
Loss before income tax (4,280) (3,701)  
Segment assets [Abstract]      
Exploration assets 214,737 209,009  
Other assets 53,507 12,683  
Total assets 268,244 221,692  
Segment liabilities [Abstract]      
Payables (1,761) (1,416)  
Provisions (169) (105)  
Total current liabilities (1,930) (1,521)  
Payables (20) (107)  
Total non-current liabilities (20) (107)  
Net assets 266,294 220,064  
Operating Segments [Member] | Australia [Member]      
Segment information [Abstract]      
Other expenses (1,416) (904)  
Employee benefits and other expenses (1,137) (1,757)  
Net financing (expense)/income 2,825 2,292  
Loss before income tax 272 (369)  
Segment assets [Abstract]      
Exploration assets 0 0  
Other assets 10,851 10,851  
Total assets 10,851 10,851  
Segment liabilities [Abstract]      
Payables (148) (421)  
Provisions (224) (198)  
Total current liabilities (372) (619)  
Payables (86) (77)  
Total non-current liabilities (86) (77)  
Net assets $ 10,393 $ 10,155